Linear Voltage Regulator Calculator

Linear Voltage Regulator Equation:

\[ V_{out} = V_{ref} \times (1 + \frac{R2}{R1}) \]

Output Voltage (V_out):

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1. What is the Linear Voltage Regulator Equation?

The linear voltage regulator equation calculates the output voltage of a standard adjustable voltage regulator circuit based on the reference voltage and two external resistors. This configuration is commonly used in power supply designs.

2. How Does the Calculator Work?

The calculator uses the linear voltage regulator equation:

\[ V_{out} = V_{ref} \times (1 + \frac{R2}{R1}) \]

Where:

\( V_{out} \) — Output voltage (volts)
\( V_{ref} \) — Reference voltage (volts)
\( R1 \) — First resistor (ohms)
\( R2 \) — Second resistor (ohms)

Explanation: The equation shows that the output voltage is determined by the reference voltage multiplied by one plus the ratio of the two resistors.

3. Importance of Voltage Regulation

Details: Accurate voltage regulation is crucial for electronic circuits to ensure proper operation of components. Linear regulators provide stable output voltage despite variations in input voltage or load current.

4. Using the Calculator

Tips: Enter reference voltage in volts, and both resistor values in ohms. All values must be positive numbers. Typical reference voltages are 1.25V for many adjustable regulators.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for R1 and R2?
A: R1 is often between 100-240Ω, with R2 calculated based on desired output voltage. Higher values reduce power waste but may affect stability.

Q2: Can I use this for switching regulators?
A: No, this equation is specific to linear regulators. Switching regulators use different control methods.

Q3: What affects the accuracy of the output voltage?
A: Resistor tolerance, reference voltage accuracy, temperature variations, and regulator quality all impact the final output.

Q4: How do I choose appropriate resistor values?
A: Select R1 first (typically 120Ω), then calculate R2 based on desired output voltage. Use standard resistor values where possible.

Q5: What's the maximum output voltage possible?
A: Limited by the regulator's maximum input-output differential and absolute maximum voltage ratings. Consult the regulator's datasheet.